From 802f3427132ac1d3ebbde92d6712f35960cc8354 Mon Sep 17 00:00:00 2001
From: yong qian <qianyong@oppo.com>
Date: Tue, 15 Sep 2020 21:14:57 +0800
Subject: [PATCH] ANDROID: vendor_hooks: Add hooks for debugging exception
 context
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When some processes crashed, we want to save cpu regs(x0-x30、pc、sp)，
and context(task_struct、thread_info) to log for debugging

Bug: 166228327

Signed-off-by: yong qian <qianyong@oppo.com>
Change-Id: I4f49ffed583a0e20f1aaa7e445e85a0cbb603bbe
---
 arch/arm64/kernel/process.c    |  2 ++
 drivers/android/vendor_hooks.c |  2 ++
 include/trace/hooks/minidump.h | 24 ++++++++++++++++++++++++
 3 files changed, 28 insertions(+)
 create mode 100644 include/trace/hooks/minidump.h

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 08637a8d911f..a07a5feeb9fe 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -55,6 +55,7 @@
 #include <asm/pointer_auth.h>
 #include <asm/scs.h>
 #include <asm/stacktrace.h>
+#include <trace/hooks/minidump.h>
 
 #if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK)
 #include <linux/stackprotector.h>
@@ -254,6 +255,7 @@ void __show_regs(struct pt_regs *regs)
 		top_reg = 29;
 	}
 
+	trace_android_vh_show_regs(regs);
 	show_regs_print_info(KERN_DEFAULT);
 	print_pstate(regs);
 
diff --git a/drivers/android/vendor_hooks.c b/drivers/android/vendor_hooks.c
index 2ed3b8b2bccf..4dc0d89c835b 100644
--- a/drivers/android/vendor_hooks.c
+++ b/drivers/android/vendor_hooks.c
@@ -17,6 +17,7 @@
 #include <trace/hooks/fpsimd.h>
 #include <trace/hooks/topology.h>
 #include <trace/hooks/debug.h>
+#include <trace/hooks/minidump.h>
 
 /*
  * Export tracepoints that act as a bare tracehook (ie: have no trace event
@@ -56,3 +57,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_futex_plist_add);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_is_fpsimd_save);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ipi_stop);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_printk_store);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_show_regs);
diff --git a/include/trace/hooks/minidump.h b/include/trace/hooks/minidump.h
new file mode 100644
index 000000000000..11283e43322d
--- /dev/null
+++ b/include/trace/hooks/minidump.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM minidump
+
+#define TRACE_INCLUDE_PATH trace/hooks
+
+#if !defined(_TRACE_HOOK_MINIDUMP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HOOK_MINIDUMP_H
+#include <linux/tracepoint.h>
+#include <trace/hooks/vendor_hooks.h>
+
+#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_ANDROID_VENDOR_HOOKS)
+struct pt_regs;
+DECLARE_HOOK(android_vh_show_regs,
+	TP_PROTO(struct pt_regs *regs),
+	TP_ARGS(regs));
+#else
+#define trace_android_vh_show_regs(regs)
+#endif
+
+#endif /* _TRACE_HOOK_MINIDUMP_H */
+/* This part must be outside protection */
+#include <trace/define_trace.h>
+